Electrical Cables
The advantage of cables over overhead transmission lines is

Easy maintenance
Low cost
Can be used in high voltage circuits
Can be used in congested areas

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Electrical Cables
Capacitance grading of cable implies

Capacitance required to be introduced at different lengths to counter the effect of inductance
Use of dielectrics of different permeabilities
Cables using single dielectric in different concentrations
Grading according to capacitance of cables per km length

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